WO2005087152A2

WO2005087152A2 - Drainage sac

Info

Publication number: WO2005087152A2
Application number: PCT/CH2005/000139
Authority: WO
Inventors: Urs Koch; Hansruedi KÜNZLER; Richard Röllin
Original assignee: Medela Holding Ag
Priority date: 2004-03-17
Filing date: 2005-03-08
Publication date: 2005-09-22
Also published as: WO2005087152A3; JP2007529244A; EP1725196B1; EP1725196A2; JP4486679B2

Abstract

The invention relates to a drainage sac for accommodating aspirated body fluids, comprising a connector element (4) for connection to a drainage line, provided with a one-way valve (8), permitting a flow of body fluids from the drainage line into the drainage sac (B) and preventing a flow of body fluids from the drainage sac (B) into the drainage line. Said drainage sac (B) prevents a backflow of the fluid already aspirated in a simple manner and fulfils the highest hygiene requirements.

Description

drainage bag

Technical field

The invention relates to a drainage bag according to the preamble of the claim

State of the art

Collecting containers are used to suck up body fluids in the medical field, for example during or after surgical interventions, but also in wound drainage, thoracic drainage or when sucking off body fat, which are connected to a mammal pump on the one hand and to a patient on the other hand connected drainage line. A negative pressure is generated in the collecting container by means of the suction pump, so that the body fluid can be sucked off through the drainage line and collected in the collecting container. The collecting container is usually made of a rigid material and has a tightly closable lid.

In order to meet today's hygiene regulations, however, the liquid is usually not collected in the rigid container itself, but in a disposable bag which is arranged in the collecting container. Such a disposable bag filled with liquid in this way, also called a drainage bag, can be easily removed and disposed of appropriately. The collecting container is cleaned and reused. EP-A-0'861'688 discloses such a disposable bag for holding liquid to be suctioned off. It has a rigid head part, on which a connection element for the drainage or suction line and a further opening for connection to the suction source is arranged. This rigid head part can be fastened to a lid of the collecting container, the connection element for the drainage line simultaneously serving as fastening means for fastening the drainage bag to the lid. This drainage bag has proven itself in practice.

If handled incorrectly, however, it may happen with certain drainage bags that liquid that has already been drawn off is pressed back to the patient. This happens in particular when the vacuum pump is not switched off at the end of a pumping process, but the line is otherwise interrupted, for example by pulling out the connecting hose between the drainage bag and the vacuum pump.

If it is your own body fluid, this can already have negative consequences. However, the daily practice of individual hospitals poses an even greater hygiene risk: For cost reasons, a bag that has not yet been completely filled by a first patient is often used in a second or third patient. Only the drainage line is replaced. If incorrect handling occurs in the case of one of these subsequent patients and thus the liquid already in the bag flows back, this can have serious health consequences.

Presentation of the invention

It is therefore an object of the invention to provide a device which overcomes this problem.

This problem is solved by a drainage bag with the features of claim 1. The drainage bag according to the invention for receiving sucked-off body fluid, which has a connection element for connection to a drainage line, is provided with a one-way valve which allows a flow of the body fluid from the drainage line into the drainage bag and which prevents a flow of the body fluid from the drainage bag into the drainage line.

In a preferred embodiment, the one-way valve is arranged on an inlet socket of the drainage bag, wherein it has a tongue which covers an inlet opening of this socket. This design of the one-way valve is inexpensive, so that it does not significantly increase the production costs of the drainage bags used as one-way bags. The inlet connector preferably forms the extension of the connection element on the inside of the bag.

In a preferred embodiment, the disposable bag has a rigid head part, on which the connection element is arranged and on which there is preferably also an opening for connection to a suction source, which generates the vacuum necessary for the suction.

Further advantageous embodiments emerge from the dependent patent claims.

Brief description of the drawings

The subject matter of the invention is explained below using a preferred exemplary embodiment, which is shown schematically in the accompanying drawings. Show it:

FIG. 1 shows a perspective illustration of a drainage bag according to the invention;

FIG. 2 shows a perspective illustration of a rigid head part of the drain nail bag according to Figure 1 and

FIG. 3 shows a perspective illustration of a one-way valve according to FIG. 1.

Ways of Carrying Out the Invention

To make it easier to see the features essential to the invention, the drainage bag is shown upside down in the figures. Its position of use is usually rotated by 180 °, which means that the connection nipple described below projects upwards and the film 1 downwards.

FIG. 1 shows a drainage bag B according to the invention. It consists essentially of a flexible material, in particular a film 1 welded into a bag, and a rigid head part 2, which is welded to the film 1. The drainage bag B is tightly closed except for 2 openings in the head part.

The film 1 can be designed as a standing pouch. However, it can also simply consist of two foil sheets lying opposite one another, which are welded to one another. It can also be designed as a tubular bag, one transverse side of which is closed with a weld seam and the other opposite transverse side of which at least partially surrounds the rigid head part 2.

The rigid head part 2 is preferably made of a plastic. It has a base plate 3 to which the film 1 is welded. As can be clearly seen in FIG. 2, the base plate 3 is provided with a through opening which is surrounded by a connection element 4. The connecting element 4 has a connecting nipple 40 to which a drainage line, not shown here, leading to the patient can be connected. The connecting element 4 also has latches 41 which surround the connecting nipple 40 and which are releasable Attach the drainage bag B in a rigid drainage container, not shown here. A closure cover 5 is also articulated on the base plate 3 and closes the connection nipple 40 before and after use of the bag B. The cover 5 is preferably slipped over the latches 41, wherein it has an inner socket which protrudes sealingly into the connecting nipple 40.

The rigid head part 2 preferably also has an opening 6, which is used for connection to a suction source, not shown here, in particular a suction pump. So that the suction source is protected from the extracted body fluid, this opening 6 is closed with a membrane 7, for example a hydrophobic filter. This filter 7 is preferably arranged in a suction nozzle 60 protruding into the bag interior.

Similar bags are described and shown in EP-A-0'861'668 mentioned in the introduction. The disclosure content is hereby integrated into this application.

However, the drainage bag B according to the invention additionally has a one-way valve 8 which allows a flow of the body fluid from the drainage line into the drainage bag and which prevents a flow of the body fluid from the drainage bag into the drainage line.

In the embodiment shown here, the rigid head part 2 has an inlet connection 42 for this purpose, on which the one-way valve 8 is arranged. This inlet connection 42 is here the extension of the connection element 4 protruding into the bag interior I, so that the one-way valve 8 is arranged on a side of the connection element 4 facing away from the drainage line.

The one-way valve, as shown in FIG. 3, has an essentially cylindrical tubular base body 80 which encloses the inlet connection 42.

On this basic body 80, a flat tongue 82 is movably arranged over a connecting web 81 and covers the inlet opening of the inlet connector 42 and rests on its upper face. Due to the negative pressure generated in the interior of the bag I, the tongue 82 is pulled away from the opening of the inlet connection 42 and releases the opening for the sucked-in body fluid flowing into it. The flat web 81 facilitates the opening movement. If there is no negative pressure in relation to the atmosphere or the environment in the interior of the drainage bag I, the tongue 82 lies sealingly on the inlet connection 42. This one-way valve 8 is preferably made of a slightly elastic material, in particular a relatively stiff rubber. As a result, it can be placed over the inlet connection 42 in a simple manner.

If the head part 2 has the suction nozzle 60, as shown here, the inlet nozzle 42 is preferably shorter than the suction nozzle 60, so that the latter protrudes further into the bag interior I. Furthermore, the tongue 82 of the valve 8 is preferably arranged such that the connecting web 81 faces the suction nozzle 60. These dimensions allow splash protection, so that the membrane 7 does not come into contact with liquid as far as possible and can therefore clog less quickly.

An anti-rotation device is preferably also provided so that the one-way valve 8 can be arranged in a defined position. In the example shown here, the base body 80 therefore has an essentially circular inner wall which is flattened in the region of the connecting web 81 and thus forms an anti-rotation device when it bears against the circular jacket of the inlet connector 42. Alternatively, a corresponding flattening can also be arranged on the outer jacket of the valve 8.

Restraining means can also be present in order to hold the one-way valve 8 in its position. For example, the inlet connection 42 can be provided with retaining knobs, a bead or with retaining ribs. It can also be conical.

The drainage bag B described above is a preferred embodiment. It However, other drainage bags can also be provided with such a one-way valve. For example, the one-way valve can also be arranged on the outside of the bag. The bag does not necessarily have to have a rigid head part. The bag also does not necessarily have to have an opening for connection to a suction source. The bag can also have further openings, for example openings for easier emptying of the bag.

The drainage bag according to the invention simply prevents the already sucked-off liquid from flowing back and meets the highest hygiene requirements.

Bezugszcichenliste

B drainage bag

I bag interior

1 slide

2 headboard

3 base plate

4 connection element

40 connection nipples

41 pawls 42 inlet spigot

5 sealing caps

6 Opening 60 suction nozzle

7 membrane

8 one-way valve 80 basic body

81 connecting bridge

82 tongue

Claims

claims

1. drainage bag for receiving suctioned body fluid, the drainage bag having a connection element (4) for connection to a drainage line, characterized in that the drainage bag is provided with a one-way valve (8) which allows a flow of the body fluid from the drainage line into allows the drainage bag and which prevents a flow of the body fluid from the drainage bag into the drainage line.

2. Drainage bag according to claim 1, wherein the drainage bag has a rigid head part (2) and wherein the connection element (4) is arranged in the rigid head part (2).

3. Drainage bag according to one of claims 1 or 2, wherein the one-way valve (8) is arranged on the connecting element (4).

4. Drainage bag according to one of claims 1 to 3, wherein the one-way valve (8) is arranged on a side of the connection element (4) facing away from the drainage line.

5. Drainage bag according to one of claims 1 to 4, wherein the drainage bag has an inlet port (42) and wherein the one-way valve (8) is arranged on this inlet port (42).

6. Drainage bag according to claim 5, wherein the inlet connector (42) is provided with retaining means.

7. Drainage bag according to one of claims 5 or 6, wherein the one-way valve (8) has a cylindrical tubular base body (80) which surrounds the inlet port (42), and wherein the one-way valve (8) further comprises a cylindrical body (80) has a movably arranged tongue (82) which covers an inlet opening of the inlet connector (42).

8. Drainage bag according to one of claims 1 to 7, wherein the drainage bag has an opening (6) for connection to a suction source.

9. Drainage bag according to claims 2 and 8, wherein this opening (6) is arranged in the rigid head part (2).

10. Drainage bag according to claim 2, wherein the drainage bag, with the exception of the rigid head part (2), is made of a flexible material, in particular a plastic film formed into a bag.

1 1. Drainage bag according to claims 5 and 8, wherein the opening (6) for connection to the suction source has a suction pipe (60) projecting into an interior (I) of the drainage bag, the inlet pipe (42) being shorter than the suction nozzle (60).